Rotary diamond tool



April 10, 1956 H. s. NAGODE 2,741,239

ROTARY DIAMOND TOOL.

Filed Sept. 22, 1953 2 Sheets-Sheet 2 Henry 3 A/agoae 1N VEN TOR.

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United States Patent O ROTARY DIAMOND TOOL Henry S. Nagode, Bnena Park, Calif, assignor of twentyfive per cent to Donald D. Dixon and twenty-five per cent to Stephen F. Gallagher, both of Anaheim, Caiif.

I Application September 22, 1953, Serial No. 381,68

' 3 Claims. (Cl. 125-11) This invention relates to a rotary diamond tool and more specifically provides a tool for dressing abrasive grinding wheels.

An object of this invention is to provide a rotary diamond tool that will automatically rotate through a part of a revolution each time it travels across the face of a 1 grinding wheel.

Another object of this invention is to provide a rotary diamond tool having an improved sealing structure for excluding abrasive dust from the interior of the diamond tool.

A. further object of this invention is to provide a rotary diamond tool which has a positive indexing means for the diamond tool which will avoid the formation of flat portions upon the diamond due to the action of the abrasive friction of the wheel being dressed.

Another object of this invention is to provide a rotary diamond tool which prevents a diamond from cracking and chipping often occurring in repeated dressing.

A still further object of this invention is to provide a rotary diamond tool which is accurate, easy to operate,

positive in action and inexpensive to manufacture.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1.is a side elevation of the rotary diamond tool of this invention with portions of the operating shaft broken away;

Figure 2 is a top plan view with portions broken away showing the interengaging ratchet gear and spring urged pawl;

Figure 3 is an end view of the diamond tool of this invention looking at the right hand end of the device of Figure 1;

Figure 4 is a transverse, vertical section taken substantially along thte center line of the device of Fig ure 3;

Figure 5 is a transverse, top plan section taken substantially along section line 5-5 of Figure 3 showing details of the friction spring;

Figure 6 is a perspective detail of the diamond mounting shaft;

Figure 7 is a perspective detail view of the operating shaft housing; and

Figure 8 is a perspective detail view of the operating shaft.

Referring now specifically to the drawings, it will be seen that the numeral 10 generally designates the rotary diamond tool of this invention including an upper housing member 12 and a lower housing member 14 joined together by recessed screws 16 and provided with a projecting stud 18 on the lower housing 14 for securing the diamond tool 10 in a suitable carrier with the flat portion 20 of the stud 18 providing a locating and keying ice 4 means for the diamond tool 10 in a truing attachment of a grinder.

As best seen in Figure 4, the housings 12 and 14 are provided with an elongated bore 22 with the bore ending in a counterbore 24 in the bottom portion of the lower housing 14. A diamond mounting shaft 26 is rotatably received in the bore 22 with a projecting bearing portion 28 received in the counter-bore 24. The shaft 26 is provided with a ratchet gear 30 adjacent its lower end with the bearing portion 28 projecting therefrom. The center portion of the shaft 26 is in the nature of a frictional bearing surface and a shoulder 32 is provided adjacent the midportion of the shaft 26 and a diamond 34 is mounted on the outer tapered end of the shaft 26. in the assembling of the diamond tool 10, the lower housing member 14 is assembled with the shaft 26 and a coil spring 36 is placed around the upper portion of the shaft 26 with the lower end of the spring 36 engag ing the shoulder 32. The upper housing 12 having an 0 ring seal 38 in the bore 22 is placed over the lower housing 14 and the upper end of the spring 36 engages a shoulder 40 in the housing 12 thereby maintaining the shaft 26 in frictional engagement with the housings 12 and 14. The recess screws 16 are then tightened bringing the matching faces of the upper housing member 12 and the lower housing member 14 intocontact for sealing the upper portion of the diamond tool 10. The lower portion of the lower housing 14 is provided with a cutaway portion providing an entrance 42 to the ratchet gear 30. An operating shaft housing 44 is secured to the cutaway portion by a suitable recessed screw 46 and the lower surface of the operating shaft housing 44 is flush with the lower surface of the lower housing member 14 thereby providing an even seat for the tool mounting member 10. The operating shaft housing 44 is provided with a recessed portion 48 having an entrance opening facing the opening 42 and in alignment therewith thereby providing access to the ratchet gear 30. An operating tripper shaft 50 is slidably mounted in the housing 44 and a pawl 52 is pivoted to the end of the shaft 50 by a vertical pivot pin 54. The pawl 52 is provided with ratchet teeth 56 for matching engagement with the ratchet gear 30 and the rear portion of the pawl 52 is provided with a bore 58 for receiving a coil spring 60 and a guide therefor wherein the pawl 52 is urged about the pivot pin 54 into engagement with the ratchet gear 30. The housing 44 is provided adjacent its outer end with a bore 64 for receiving a coil. spring 66 surrounding the operating shaft 50 and engaging the inner portion of the bore 64. The shaft 66 is provided with an enlarged portion 68 slidably received in the bore 64 and abutting the other end of a compression spring 66 and an O ring 70 is provided adjacent the outer end of the bore 64 for sealing the enlarged portion of this shaft against entry of abrasive dust into the interior of the housing. The enlarged portion 68 of the shaft 5i) provided with an internally threaded bore 72 for receiving a threaded member 74 having an abutment head 76 on its outer end and a lock nut 78 is provided on said screw threaded member 74 for locking the abutment lien 76 in relation to the enlarged portion 68 of the shaft 58 thereby adjusting the eifective length of the shaft 50. The juncture between the operating shaft housing 44 and the lower housing member 14 is provided with a suitable sealing compound thereby excluding dust from the interior of the rotary diamond tool 10 and the 0 rings 38, 70 and the sealing compound completely seal the interior of the rotary diamond tool thereby providing an accurate and long wearing device.

The operation of the device will be readily understood. With the rotary diamond tool mounted on a suitable truing attachment by the use of the stud 18, the diamond for'its'second dressing operation. lfhe ratchet gear 30 is provided with a totalof;25teeth'and-upon each actuation oi the operating shaft S G theshaft 26-is rotated one twentyfifth of' a revolution or slightlymore than 14 degrees, The spring 66 automatically'iieturns the shaft to its normal position wherein the pawl"5;2'is again engaged with another tooth of the raiohet gear @(lind ready' for its next dressing operation. It" will be noted that the compression spring 36' around the 'shaftlfi' precludes any rotation oi the shaft ;26 under the influence of the grinding wheel and thereby maintains the device in accurate relation to the grinding wheel. The O ring seal 38- in the upper housing-12 provides a resilient positioning means for the shaft 26 as well as providing a seal for-the housing. By removal of the recess screws 16 and 46 the device may be disassembled for cleaning and repair as may become necessary during operation. Obviously, this device may be used-in conjunction with centerless grinders or cylindrical grinders with equal facility and accuracy of operation. "The particular material used in the construction ofthis device may be chosen from any number of suitable materials known in the industry and' meeting the requirements of this device.

from the foregoing, the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claims. 7

What is claimed as new is as follows:

' l. A rotary diamond tool comprising a housing, a spindle journaled in said housing, a diamond mounted on said spindle, a ratchet gear integral with said spindle and disposed in said housing, a spring biased pawl slidably, and pivotally mounted on said housing and engaging said ratchetgearg means f or reciprocating said pawl or ro at n. a d sc an pi d e and a Q-ring s 1 oi rtms li onins e n encircling sai pi r a wb ns rat w d wl st s d q eng g the rotatingWork, said housing constructed of a pinalit q d taq eb e v sst q s sa .Q s g re nt y oam n he pi l a a s simdi movement, Said p w .eq u nj@alee sliaq udi s fl pp shaft a mb a ng a asin w h. a l ta s said r t t sca pa i v t l y nflat d and a coil spring disposed between the rear surface of i on one end; of said tripper shaft 7 said pawl and the casing, the other end of said shaft includinganabutment for-reciprocation ofsaid shaft and spring means to return said shaft to its extended position.

2. A rotary diamond tool comprising a housing, a spindle journaled in said housing, a diamond mounted on said spindle, a ratchet gear integral with said spindle and disposed in said housing, a spring biased pawl slidably and pivotally-mounted on said housing and engagingsaid ratchet gear, means for; reciprocating said pawl; for rotation of said gear and spindle, and an Q-ringfseal and a coil spring cushioning means encircling said; spindle for absorbing vibrations induced as the, diamond engages the rotating work, said housing constructed of a plurality of detachable sections, said coil spring resiliently retaining the spindle against longitudinal movement, said pawl actuation means including a tripper shaft assembly having a casing with a slot facing said ratchet gear, said pawl pivotally mounted on one end of said tripper shaft and a coil spring disposed between the rear surface; of

said pawl and the casing, the other end, of said shaft-in clud-ingan abutment foi" reciprocation of said shaft and spring means to return said-shaft to its extended position, said abutment on said tripper shaft is adjustable for varying the length of stroke of the pawl for adjusting and the degree of rotation of said 'diamond holding spindle. 1

"3'. A rotary diamond tool comprising a housing-a spindle journaled in said housing, a diamond mounted on said spindle, a ratchet gear integral withsaid spindle and dispo'sed in said housing, a spring biased pawl slidably' and pivotally ,rnounted'on said housing and engaging said ratchet gear, means for reciprocating said pawl for rotation of saidgear and spindle, and an O-ringseal and a coil spring cushioning means encircling saidspindle for absorbing vibrations induced as the diamond engages the rotating work, said'honsing constructed of a plurality of detachable sections, said coil spring resiliently retaining the spindle against longitudinal movement, said" pawl actuation means includin ga trippershaft assembly having a casing with a slot-facing said ratchet :gear, said pawl'pivotally mounted on one end ofsaid tripper shaft and a coil spring disposed between the rear surface of saidpawl and the casing, the other end of saidshaft including an abutment -forreciprocation of said-shaft and spring means to return said shaft to its extended position and, a sealing compound disposed between said housing and said casirig for preventing the entrance of abrasiy dust into the interior of said housing and easing.

a, 7. ,Fe 41125 11 Jul 1-253- 

